Most of the mine product is hard coking coal used for steel making.

A small quantity of steaming blend coal used for power generation is also produced.

[3] The colliery is connected to the Main Southern railway line via a balloon loop that opened in May 1981.

[5][6] Tahmoor Colliery has a history of outbursts where gas trapped in the coal violently escapes during mining, throwing hundreds of tonnes of coal and rock, and large amounts of suffocating gas.

[7] In September 2018, two men were trapped 160 metres (520 ft) underground when the lift cage jammed in the mine shaft.